Writing a short review to counterbalance some of the more negative reviews (of the armchair detectives that happily pass judgement). Though, I do agree the documentary doesn't present the case particularly well, or their argument of the case's failures, and without Serial and Undisclosed, this documentary wouldn't receive any attention/acclaim, which is a pity.
I have no idea if Adnan is guilty, but what is clear is, that the police investigation, trial, and succeeding actions of the judicial system, have little interest in providing justice on the basis of evidence (which should be of concern to everyone). Is that due to it being an inconvenience, general incompetence or institutional corruption?
In any event, reviewers should look to the title of the documentary, and then consider whether the state made its case (based on information/evidence available) before offering their opinions. The documentary highlights that it didn't, though this could have been argued better.